Add treesit-aggregated-simple-imenu-settings

Now we support setting up Imenu for multiple languages

* doc/lispref/modes.texi: Update manual.
* lisp/treesit.el:
(treesit-aggregated-simple-imenu-settings): New variable.
(treesit--imenu-merge-entries): New function.
(treesit--generate-simple-imenu): This was previously
treesit-simple-imenu.
(treesit-simple-imenu): Support
treesit-aggregated-simple-imenu-settings.
(treesit-major-mode-setup): Recognize
treesit-aggregated-simple-imenu-settings.
* test/src/treesit-tests.el (treesit-imenu): New test.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/src/treesit-tests.el b/test/src/treesit-tests.el
index 50f205421d7..43102fc97e0 100644
--- a/test/src/treesit-tests.el
+++ b/test/src/treesit-tests.el
@@ -1270,6 +1270,20 @@ This tests bug#60355."
     (should node)
     (should (equal (treesit-node-text node) "2"))))
 
+;;; Imenu
+
+(ert-deftest treesit-imenu ()
+  "Test imenu functions."
+  (should (equal (treesit--imenu-merge-entries
+                  '(("Function" . (f1 f2))
+                    ("Function" . (f3 f4 f5))
+                    ("Class" . (c1 c2 c3))
+                    ("Variables" . (v1 v2))
+                    ("Class" . (c4))))
+                 '(("Function" . (f1 f2 f3 f4 f5))
+                   ("Class" . (c1 c2 c3 c4))
+                   ("Variables" . (v1 v2))))))
+
 
 ;; TODO
 ;; - Functions in treesit.el